生物质热解气喷雾冷凝的传热传质特性  

Heat and mass transfer characteristics of spray condensation of biomass pyrolysis gas

作　　者：程文龙[1] 谢鲲[1] 张荣明[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,安徽合肥230027

出　　处：《化学工程》2010年第11期27-30,共4页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(50876096);国家重点基础研究计划项目(973计划项目)(2007cB210200)

摘　　要：生物质热解气的快速冷凝是影响生物油品质和出油率的关键因素之一。喷雾冷凝是实现快速冷凝的有效方法。文中以生物质热解气的关键组分所形成的多组分体系为研究对象,采用多组分体系传热传质经典的膜模型,使用Maxwell-Stefan方程描述其质量传递,结合气液相际传质的特点,进行了喷雾冷凝过程中的传热传质耦合计算。通过计算获得了液滴直径、液滴平均温度以及混合气体平均温度的变化规律,并探讨了初始流速、喷雾液滴直径和气液质量流量比对热解气冷凝过程的影响。The rapid condensation of biomass pyrolysis gas is one of the key factors for bio-oil quality and yield.Spray condensation is a very effective way to bring it out.The coupled heat and mass transfer characteristics in the spray condensation of the multi-component system composed of the key components of biomass pyrolysis gas were studied.To describe the heat and mass transfer of multi-component system,the classic film model and the Maxwell-Stefan equation were used,combined with gas-liquid inter-phase mass transfer characteristics.Coupled calculation of heat and mass transfer in spray condensation was performed.The variation of droplet diameter,average temperatures of droplet and mixed gas were derived.The effects of the initial velocity,the diameter of the droplet and the mass flow ratio of the gas to liquid on the process of biomass pyrolysis gas condensation were analyzed.

关 键 词：生物质热解气 喷雾冷凝 MAXWELL-STEFAN方程 传热传质 

分 类 号：TK6[动力工程及工程热物理—生物能]